31601. The importance of diffusion in a catalyst are increased by
31602. A back mix reactor is
31603. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
31604. The rate of the heterogenous catalytic reaction A(g) + B(g) C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction is
31605. For a __________ order chemical reaction, , the half life period is independent of the initial concentration of the reactant A.
31606. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
31607. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to
31608. The eddy diffusivity for a liquid in plug flow must be
31609. For multiple reactions, the flow pattern within the vessel affects the
31610. The rate expression for the gaseous phase reaction, CO + 2H2 CH3OH, is given by, . Which of the following is not possible ?
31611. For the same residence time, which one will give the maximum conversion ?
31612. __________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.
31613. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by
31614. The rate constant of a reaction depends on the
31615. For the reversible reaction A 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?
31616. For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single
31617. Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.
31618. For a __________ order reaction, the units of rate constant and rate of reaction are the same.
31619. In case of staged packed bed reactors carrying out exothermic reaction, use
31620. Vegetable oils are hydrogenated in a __________ reactor.
31621. Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is
31622. The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
31623. For all positive reaction orders for a particular duty,
31624. The heat of reaction
31625. Which of the following does not produce a change in the value of rate constant of a reaction ?
31626. With increase in temperature, the equilibrium conversion of a reversible exothermic reaction
31627. In a CSTR __________ varies with time.
31628. The following gas phase reactions are carried out isothermally in a CSTR.A 2R ; r1 = k1pA ;k1 = 20mole/(sec.m3 bar)A 3S ; r2 = k2 pA ;k2 = 40mole/(sec.m3 .bar)What is the maximum possible value of FR(mole/sec.) ?
31629. As the chemical reaction proceeds, the rate of reaction
31630. Sales-Rs.1,00,000/-Profit is 25% on cost.Total cost is Rs.
31631. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.
31632. Photo-chemical reactions occur in presence of
31633. 'n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume
31634. Knudsen diffusion is directly proportional to
31635. Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.
31636. Non-catalytic fluid-solid reactions are represented by __________ model.
31637. A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be
31638. On application of pressure to the equilibrium system, ice water ; which of the following phenomenon will occur ?
31639. Participation of __________ is involved in the occurrence of a chemical reaction.
31640. Promoter.
31641. The rate constant of a reaction is a function of the
31642. Mean residence time is equal to the space time, when
31643. If 'n' is the order of reaction, then unit of rate constant is
31644. Which accounting concept considers that the firm has an indefinite life?
31645. The value of 'n' for a chemical reaction A B, whose reaction rate is CAn, will be __________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled.
31646. With the same reaction time, initial concentration and feed rate, the reaction 2A B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be
31647. For any reaction, we may write conversion as a function of
31648. The use of space time is preferred over the mean residence time in the design of a/an
31649. Autocatalytic reactions are best carried out in a
31650. The gas phase reaction 2A B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is
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